The phrase "digression for" is correct and can be used in written English.
It is typically used when mentioning a brief departure from the main topic or theme of a conversation or writing. Example: "Before we continue with our discussion on the benefits of exercise, I would like to make a brief digression for a moment and touch on the importance of proper nutrition in achieving overall wellness."
It's a nice digression for the Decemberists, known for their highbrow wordplay and concept-driven suites.
Or will it prove to be no more than a dazzling digression for its troubled maker?
(A digression for those who skipped grade-school music class or never had one: Why does the minor chord make the heart hang heavy?
There is a long and pointless digression, for example, about a masseur who got lost on the way to an appointment.
McPhee takes the reader through his unusual repasts — fried snapping turtle, roasted weasel and muskrat chili — with a digression for a visit to a stream-channelization project.
Yet it was locked into its format: it was a magazine show about cars, and should talk about cars without digression for people who were interested in that kind of thing.
In addition, we fit generalized additive models with 3-degrees-of-freedom cubic splines to evaluate the shape of exposure response curves and to test for digression from linearity while controlling for covariates.
There are also useful digressions for context.
When I have tried to, say, reread a Dostoevsky novel, I've discovered that I don't have the patience any longer – for the long philosophical digressions, for example.
But as the book progresses, the reader begins to realize that such musings are less digressions for the sake of digression than illuminating asides that underscore the marvelous complexity of nature, its fragile system of checks and balances, and the domino-like effect that change and flux can have on its intricate machinery.
Chapters on "As You Like It" and "Hamlet" revert to more conventional textual analysis, interlarded with biographical speculations and digressions; for instance, Rosalind's journey to Arden may derive from Shakespeare's annual trip to Stratford to see his wife and daughters, and the "limbs with travel tired" of the twenty-seventh sonnet perhaps reflect the poor condition of English highways.
